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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ab6745ec8d5adb4305b71b60b1a653d1fb52695afaf7e1fade9bd116b3e2eb' 
  AND token = 'g4qLsA2mFd3rCJmoMtGyuJY7mKYNNWaRCkgsAKGgUSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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