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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71647540941a04e189a25632ccac3801afc681b73862d19f615edf0da4fc0ec' 
  AND token = 'ulCJ110BQwGldnoHOWZmbDIlDAW3cwO6z/CYqYSNOZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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