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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffb46bc8a02ffc77bfeda1b7436e0dd5a442761bdcdc8b81c245268a2f7c152' 
  AND token = 'sN2BseNrRFgH02iNNx+A06tmiFmuFpQ7tfryp5ND6e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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