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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f3097dc2867f9c5fcb6ed6773512f6fe5a65d8a0c76286bfb6904306e167ef' 
  AND token = 'GujDfCQaTlKnmnESqQX8EwjLJFebGow9SsgGGwrvwXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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