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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9952da188e58b6f60fbfd31d1ba8e1d1b4473d65bcd96da57f09aa7010cd34e' 
  AND token = '+fd4vtrHYNSuSXOkqU4Ouk8VWoSXf+kJcZID9PT73WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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