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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ab6eb50db461b901799f5bfadc674d00aebb207eae34f0761db087ce1ebfd4' 
  AND token = 'viMSvmLQRsPuooG85aHep1LQVTB9swaG9HOFRnIm01c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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