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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3131d571174bb160881bcdf0bdc9b87cabada9c562fb5247b5bfc4c9ffb2119a' 
  AND token = '3Iy3AEnKlojOiwB1dwuHGc0rwdSG4w1AE7DU/wBClDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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