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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3033850b543030f9ba1a244d64834e71fe148ad239a629699be525204adb51' 
  AND token = 'swdhh7I3rsxqZzFR3jY1shFOyxDOcd3RTq7TC6Fc/sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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