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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c75a2e7f2b0504839ea45b3e5e9ecc6aceed92b0d3a4a314cca925c7525dd4' 
  AND token = 'Z+6WFEOZv3zGd5irpgSgHdV3csFBTfaYIViqxdHquoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}