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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96059a96e0a4d9e63cda0b320b0ee93315d992e43f54843fe11a1c9de70c2a6' 
  AND token = 'a/+WSovCDe9lW7Iiy1UdjxUts4yi7AabD5Mfadew/UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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