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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c8451e69a8c90e2d06ea5f0363b8994aa2d71abe13baffb33530ddd88bb813' 
  AND token = 'cAMd0AhPV+D6XnpmT6VkFbCGqA8cznOQ/zX5KCs8SHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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