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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05b8372671680442c9d61125caa51638406f0bfd68bb4fc310677debe32b695' 
  AND token = 'eTF1PI/Ug1Sn6CcFfWxfSVuCL1TwnLC1x6Ma6c0vUyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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