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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6b43650de04e74f786bb0892bc6348f27e5a07ff61c1decfb2e281a88f3fb6' 
  AND token = 'sunOCjvEUIJKs0a2lafndgVHkgP5OER9Hke0RSJo+RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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