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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fea310ab4aaae25907721878bb3be15264a54f0367d4578fd7b6d98f98491d' 
  AND token = 'EFL2wNjLeEKGWplDQ0p2gx5l1WAzWR1z2mClbLjQnTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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