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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62076b32a2d65a4b771b4d04a0f8531619579c4ee65ee8ee24ac335dc85ccf64' 
  AND token = 'Za7gZcFpKV5LR31XI75Z07XorV/A+LfdWj5MwbkPi88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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