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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728c82b4a9eca79c6e38b2c23c58d155f33af28d254d92480119c5da67d74f76' 
  AND token = 'IFvObV+o+WbBUzEoSWuwf0NFpqpgf8docq9JLcD96GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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