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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3a2eec6d8302924a94cafb4c7a61ca66f42cfe27d8b0bdeb1bb573414b2155' 
  AND token = 'TukZV2kPwQ7N+cEgkCcumlS9u5B7D0/54jz4FAd1vBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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