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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90f87eb5d5708bce1565f1cd837eb77e5ada280eec19f9ca3c14638a35196fe' 
  AND token = 'Vde13KvwApx44aPnZWhK+ibC5fUWkyZK4Wibc3FWZXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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