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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3675d0db78fdf238d48d97c97b50ee7fee1339358d476ff9e867d8375e314a' 
  AND token = 'tpvdjxHxm2bbE/kd33J7ECJ4VR/uPnSzCa5qIfU4YKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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