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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d79d3ed7bf81086bf91e5104fc3783c36e74616f7ea04064e02314e52e35cab' 
  AND token = '8bId5ZjhTM+MxSawyrP3KX78RfndtU2MNAt9aTsph9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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