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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295bb5e02b1ac867d84eccf328b89f7e1cd93badd6b24bcccb1c4e01750d135b' 
  AND token = 'w4hRwM3efGpHjDtVrfZ78t4CDBkPDcb8D46xPLdMlkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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