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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea582267d58371df077a4170711158a4ec8f0fa882ed3a19d1b8492c501ceeb4' 
  AND token = 'mUJcUwgm5ldJygNVoqPsOdDIF76oxCcU/Tnsqt4YpWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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