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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c2063708917c9e42510f8cf91465167f9bad7b32eefa129adfb235ad5d1945' 
  AND token = 'E4ECzv4Cdhkjo4IiWVZSvNdg5XZth93NnXB4KUz712o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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