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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907c1b44a25e80c42a073b41a63abb60bfe70b58b8e7f104b46a5e967b28d272' 
  AND token = '+MnJ8IDBahOvfIdmZMDycunW3rLH7DM+f2zV+D8PqyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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