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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cb6e7f8ce44a2212922242304d666f5d82cddfe5d8e331cd823d6db4605d66' 
  AND token = 'K28mkrEieEBS6K1c5qmJnGwR3WUEfi/vK18cTvOyRwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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