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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a073c7c2e1fdd519b5083ccabee6daf37a0fdbaa35634befe9cbf4e550cee88' 
  AND token = 'kXJn4PfT4psrnC8LL9++VHpzqxqAo1LyJwc/TuCKknI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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