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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12947e443af39a2e36da7fc4fe8c6c8b7f65bef0813ba9a4b4e7e84cc103f55' 
  AND token = 'I2UKEE6YU65adrptToBedHN01uYcKnzX1Z1oo4s+FTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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