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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e3d3112342ab110bafa159ad37b9338a4ba690f9d4c3377e1ea6eaef879d41' 
  AND token = 'kml77s8+pm+91SvN9RJMD2yf2nPhtoVDkzNzK7K8GQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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