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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884c667b045e777ebf63ffbd7ec58ed5085a6634cbb0ce2183452088c6d036e3' 
  AND token = 'Dp7LW6Sqs+mCk1NY1yvlzuLLQKIWvhjLvtu/vUaFebM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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