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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b4ccdfb981643d0ce090d48a399e0c1133ddb7f92f4aed2498df5d8f62de0e' 
  AND token = 'izEv+AS7SxMZEze4m2HDac8l5bh3GofGtaAvJH/Utlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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