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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3087fe858dc05a9bfabd9204be272049b771d90696930a9140c8f13ad7a3643c' 
  AND token = '8AndKQ+Yja6+G2rDUeiLPRkIEU/qfUeBVW31XOnDQLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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