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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b9000ab60e06d077a8ac77a2dfb2e19a5a10d6f4c0450ea82e904a92dee800' 
  AND token = 'mpdVzH2G2lNHFcT7OFUN7jUflTJJBrlTHPQvnWjBnzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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