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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14953fdc0f7efae52f45ac583406ff0a34b222ef0cdfb6d1920f0660ceb12a3d' 
  AND token = 'rMfrFy6onsC1cKLSzn4siGIY/jLSY/pGpticloMHgwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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