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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d8dc439cb017d5e42fd8d4604c149c87c82d4f7a49491f8f04a7f282aadf80' 
  AND token = 'bnF15Rdt4IdnCax4/geMZdz6ABINbZvrxcJvN7M1br0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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