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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f6d98b55370c6712496e56b2d0c44b265040d2216fa2cb420becfc0433c6cb' 
  AND token = '5m7hOIdAlAIjXiuU40/lT07D6qBhEZ5HgU37HIWrKp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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