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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1a71a119291f978288919bad5da5b60b524287e90a9733f89f2d8b804a0068' 
  AND token = 'jK+MeOZtXi9ff23QHJkiBcfMZxCXlfqyR3o4HunXp/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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