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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4159a00dfd6da296a87ecea8617b0648cc24ad7f8231aad939b43112a1af11aa' 
  AND token = '9MUwvtrlCT+ovGGgwWc8Ecav5r38x4Vruvn2HAKV2vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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