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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034551babc945a9d4cab4f2f48daa38495bfbe3afeee47cddbe8b949e92746f6' 
  AND token = 'Bd9cL+ipoCBnhXZ3Voc0zay/p1fR+n9F2EGtP3NgDyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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