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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338c1ff9b2fa396f019569574fc5991cc4ff08fc00631c0273c68020ef81c18b' 
  AND token = '1HgDmA7xA9TiZMaBskvR0esww2s+zQjxBe/X6bYClTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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