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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bc50d798977e1c3010c8b668bcc3427f40bc63c14b2cffa2c9a9ac29344fa3' 
  AND token = 'DtHlRjipPpv1Oo9YJ150WPaiWrHcy1tdMllczYfBVzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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