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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11715c3bddf578c301f00ab1659b781e525df6751d02dc60bc8613046873f12' 
  AND token = 'N9ju8BNSlpN0O9hKLoOTSRXjSx+p5mdtiX+fM5sQSDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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