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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1707246ce90c53bfb2f6b39197d375b6bd5fa836bbd6b83b0753f0cf1652da2' 
  AND token = '20TcWaM0v8PbVo3NroFjVOFSNugriHFalKhl4Ig4zKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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