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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64fd14556c80f2dd4dead58bb206fef61c2183b48d02c93a7a69e1e2f001945' 
  AND token = 'XknewxClhw4Q/ABoVDdhU29y5YhBXUA7jktsV5NCtI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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