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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e6e57c29b5634afbdd047132359344f6be42607553e8866bc8b3ecb23864d6' 
  AND token = 'jVbc5/XFiWLMUeV0nlmHmHosiFRobqn4p257nShk+uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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