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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd9d39d8eae9b490420658f857a3ade1984a03b7a1419e6a0b1abf2065752b0' 
  AND token = 'CrrjZtig9Xhlf2hGRRFz2le2sqaB/HCxpohRlvs/D7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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