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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1068e891ee2c58600502139c3e73b09411cb01bd4b9e058243a8b71cec2749' 
  AND token = 'RaahGvsOnKsMLwbtWaBY4AgODdF6pyY0dYXRzCX+VGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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