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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaf6a534add9a94c20b43513196f0d64375443c9205b2d8e4130bae69a6d685' 
  AND token = 'IsL4ycRdIfdfG6dNWdyb/8P8yTgDzjw+YlzH2O8R4yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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