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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2d7902e54e0385b2570cff178d14d58c126f6da406c65b44562d9bee2e088f' 
  AND token = 'R+7L6dPO1CETT19U44pmYjpcaoH7le6wFdXT1uFeuvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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