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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa5fcc124a71f0e396afb93c5bba5fb4c34cb6cbdbf3382483b0f9076ab04db' 
  AND token = 'A/ufV7xXbQAbD2QFCB1D/ZBTCbIx0rjne6tmQKfsLsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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