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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45be702e6f686c9d20ded0cf860a3243ec66e159cbec5f68731e69b6e332385a' 
  AND token = '9mWAt3IukL+IBS+J6Jy0yYuuGb0FKd8ybRV/J8OWC7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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