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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a6740e04c47ea63a6d1713ccb70092fece013e95f4e48ffc3d3619552aee4f' 
  AND token = 'ktiGlFcM3eYH9t8gXz68d8oB9HGLFjNBEnqEgE8t9V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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