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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baadb3c3dc2f94ac17f87771923a3a5d3232a3efe28ab23ab4533fb727131ea' 
  AND token = 'Z6IHPiL/AdSPzaSxECFT8cyQZI8wbDHlvTEyu3BtF1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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