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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e7dd1839a24ae1acecab44c7e0fb7b1bd9e4864f099e3b26142d68259ffa22' 
  AND token = 'XGqll+xeG4I/RR5QueCa1ZCT05y8Nf7Do41ySVUYf+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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